Final answer:
Without additional context, it's unclear what 'DL codes' refers to. They might be related to technology and could be subject to various policies, but the specific constraints would depend on the exact meaning of 'DL codes.'
Step-by-step explanation:
The term 'DL codes' isn't explicitly associated with a widely recognized concept in computers or technology that can be constrained by policy.
Typically, DL might refer to 'download' or could be an abbreviation for 'driver's license,' amongst other possibilities, in various contexts. If we are referring to driver's license codes, they are indeed constrained by various policies which include transportation laws and regulations.
It would be important to have more context to provide a precise answer. If, however, 'DL codes' refers to anything related to downloads or digital licensing in a technology context, then they could be subject to intellectual property laws, copyright restrictions, and digital rights management policies.